Hi Abby,
I'm sorry that you have had a setback. It is very frustrating when this happens for no apparent reason. What I have found helpful for me is to write everything down in a notebook that I call "My Health Journal" and I mean I write EVERYTHING down. Some of the things I record are the amount of hours I sleep every night, naps taken during the day, food and beverage intake, medicene and vitamins I take, meditation/ prayer time and all activities including excercise that I do on a given day, especially if I do more than what I should have done (we all are guilty of those days and we soon suffer from then later) I also record stressful situations I encounter and doctor visit information. This kind of gives me an idea as to what may have caused or lead up to the relapse. After keeping a health journal for a while, you may find certain patterns that you can identify that made you feel worse. I know this doesn't help you now but if you don't do this already then maybe you should try it. When you can read over the information you have recorded every day, It really helps you to get to know your body better. We are all unique individuals and this helps you to be more in tune to the things that your body doesn't like

Unfortunately sometimes we have relapses for no apparent reason That alone can stress you out more which in turn makes you sicker.

I'm sure there are others on here that will be more helpful by posting additional ideas as to what may be wrong. I pray that you can figure out what is going on soon so you can feel better again. It know how upsetting it is when things are improving for a while and you are hit with a setback.

Loving Hugs,
Shari